超声辅助化学还原法制备高活性Co-B非晶态合金催化剂

Preparation of a Co-B Amorphous Alloy Catalyst for High Activity by Ultrasound-assisted Chemical Reduction Method

采用超声辅助KBH4化学还原Co(OH)2胶体法制备了粒径均匀的Co-B非晶态合金.在乙腈液相选择性加氢制取乙胺反应中,与传统化学还原法制备的Co-B非晶态合金催化剂相比,该催化剂具有很高的催化活性.这归因于其Co活性位的高度分散、Co活性位对氢的强吸附,以及Co-B非晶态合金间强电子相互作用.

Uniform Co-B amorphous alloy was prepared by ultrasound-assisted chemical reduction of Co （OH）2 colloid with KBH4. During liquid phase selective hydrogenation of acetonitrile to ethylamine, the as-prepared Co-B catalyst exhibited much higher activity than the regular Co-B obtained by direct reduction of Co^2＋ with KBH4. The excellent activity can be mainly attributed to the well dispersion of Co active sites, the strong adsorption of hydrogen on these Co active sites as well as the strong interaction between metallic Co and alloying B in Co-B amorphous alloy.